新疆石油地质

新疆石油地质 ›› 2005, Vol. 26 ›› Issue (6): 707-710.

• 综述 • 上一篇    下一篇

油气藏中烃类微渗漏与特态矿物形成

甘贵元, 余瑞娟, 崔俊   

  1. 中国石油 青海油田分公司 勘探开发研究院,甘肃 敦煌 736202
  • 收稿日期:2005-03-21 出版日期:2005-12-01 发布日期:2020-11-23
  • 作者简介:甘贵元(1961-),男,青海湟中人,高级工程师,博士,沉积地层与油气勘探,(Tel)0937-8925676.

Micro Percolation of Hydrocarbons and Formation of Sumptomatic Minerals in Oil-Gas Pools

GAN Gui-yuan, YU Rui-juan, CUI Jun   

  1. Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China
  • Received:2005-03-21 Online:2005-12-01 Published:2020-11-23

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摘要： 油气藏中烃类组分,尤其是轻烃(C1—C5)和非烃组分 H2S、CO2、H2、CO 等,沿沉积地层中孔缝系统向地表方向微渗漏,引起油气藏上方岩石中孔缝系统化学环境改变,微渗漏的烃类组分与孔缝系统周围的岩石组分相互作用,形成特态矿物。目前,已发现具实际应用价值的特态矿物是黄铁矿、磁铁矿、磁黄铁矿和褐铁矿,其形成的物质是来源于油气藏的 H2S 和沉积地层中的二价铁。特态矿物主要分布于油气藏上方沉积地层中,因此可用于油气勘探中。特态矿物法的最大特点是,可以对钻井尚未钻到的下伏地层中是否有油气层存在作出判断,对含低阻油气层的老探井进行含油气性重新评价。

关键词: 油气勘探, 烃, 特态矿物, 分布, 特征

Abstract: The micro percolation of hydrocarbon group in oil-gas pools, of which light hydrocarbons (C1-C5) and non-hydrocarbons (H2S,CO2, H2, CO, etc.) along pore-fissure system in depositional strata towards the earth surface can result in variation of geochemical environment in the system in depositional strata on the oil-gas pools.By interaction between the percolated hydrocarbon compositions and the rock components around the pore-fissure system, the sumptomatic minerals are formed.Up to now, the sumptomatic minerals valuable in field application are pyrite, magnetite, magnetic pyrite and limonite formed by substances like H2S and bivalent iron in deposits.According to their distribution in upper part of reservoirs, the sumptomatic minerals can be applied for petroleum exploration.Hence, the method of sumptomatic minerals can be used for forecasting oil/gas-bearing reservoir underlying the stratum not drilled in well, and for re evaluating the oil/gas-bearing conditions of old wells with low-resistivity pay zones.

Key words: petroleum exploration, hydrocarbon, sumptomatic mineral, distribution, feature

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